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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8c344493544ce52dbac7e3412e83ff28395be9a1370377449afcd36fd09215c' 
  AND token = 'u9R37bEDZUCOAXHyDhn4JaNFmxztXZLXVRAeXpRL+a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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