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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1737bf32fddbba3277d9c77032b11b04d0ed67eaf4f6a46aa997b366c01f18a' 
  AND token = 'A/tF7FufQZWLR/4ilS0PLr0C1ZXJ/Mqu0hU4qDCMFzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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