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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aecf0e494e2aada1e7659d126ff9524b2bcb4906bbcef18636f2e7366b891052' 
  AND token = '4jkWfngcFBCr235W5H3A2peeRC2Ix63/fNPOwIQmlI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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