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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8136505820163b9caba7834dd218f82c9af5d834593db6f40d6507b5a883994b' 
  AND token = 'HKIOw2R4DgGKl+nWSoz39i1TIVxH6dOyjObIib9b/iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}