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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33fb0edae0129dcdf8f6425a1e287d555c7893ad4dddb6f33920c068bdc1bcbf' 
  AND token = 'k7DEBEdNSxl8VbKb6xPihUV3Q29mPXNevDHjTnBeMIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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