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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f1dad9d1f6dee5300cf6df9f3e8594ea8024989f8656a8b1d4f22ac0a24957' 
  AND token = 'pJa6DEweYSEERI+JHyH6nK2QieDiNePRwD1Ro28U5P8=' 
  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"
    }
  }
}