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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3aa1c8266070a23c2d3dbe259292d460ce4a714daa5261957c4f6588adbcd4d' 
  AND token = 'p9YeoG4M8yr4JfJMTtzhzrLdBbY0A4QimktHBFv1Z4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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