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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7036d40b1870d90460843044b23cb87b17568611a4756dc3b42c9b52cc25d1f7' 
  AND token = 'amMG4BfheNmeHxenWYCL1Gp76PziFudYzwOuN+Ki+AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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