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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c75a3ed6c06eec46b7078310b4bfe0636c7c8386cb36d6e3f254ed520d35ea26' 
  AND token = 'uCWFoQoM9WArL3FvT2mvobtUTnTKWN9EfW7A85pwlhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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