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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2fe572d79bb3e0f60b364f4b563bf4f3e0ac0b579fe7d8de32a4c14ad3a62e' 
  AND token = 'eYQ7Lj3KKK+ZsUaS7Yebme/s3df2e93iDZxhc/n+ynM=' 
  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"
    }
  }
}