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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b128fd81423433e7ad2dbad936d6b49bce09aacbd89f8f5d86842d90fc996fb5' 
  AND token = 'Vt3eKYtpDidZEQ/Z525K/2DaQGZZ5ZT72GI1xLBIVA8=' 
  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"
    }
  }
}