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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd804439c6f72b95f262c234334465d4a2ce283e903a5ff514726873b1923657' 
  AND token = 'gmVnGP49e0yWXIRLVObe4lIQhGi3Jd7y5aLUBRm209Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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