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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c5a0c51f8b3865b64b8d3639a5a82565c825a01d7e2db34858ab2f71928b25e' 
  AND token = '8Jn8kNgAkkZJRMHBUaJr0q4OkNtYZ9e5RqWn1sgWeNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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