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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e5ad8c9c3b1284bedb915451b79d4a134d627192bd2ed203281d4409e51450a' 
  AND token = 'wy6F+xnjaD7NHnDLUjdTqHQLeqbZIZc6u/AKDNZDs28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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