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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b888381507ac4f654a3b9cbc6af55ff0df95f16efe2dcf6e0132bd6ead5f09' 
  AND token = 'jKdM1PafUnQLS2eqMfpz+NQUW2qF7yr+lG877xQGAmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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