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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6934946e121d3098abcbbed253b1c31656cf6c8513c7ac0694834100bb2c87f' 
  AND token = 'Rt9JSWaP9yqMX2Sviw66zJRc/l1sEC4KaLGmcGHz1kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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