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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68df0e81a183824f7275f145f31610b37fb425c398e4dbfcf2ec460bf6e44139' 
  AND token = 'NOv9d5E1pPb4EE1vxy2lZg0bNWsMhg8DS2cSPhtTNPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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