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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3542275b94386672cbc219c99c8fb994a6be88b0b32cf81c72d1ddae9217b5c9' 
  AND token = 'ULYV2wEeaNeL6YI6exD+I+gpZrtYEXuuHRFZvXAwKv0=' 
  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"
    }
  }
}