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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d4d26eaa02804890f7652e76580b21c3a4de49661f00f831cd0c0263f5ec276' 
  AND token = 'SRyaI3PQSaxKbvNAdw/1t8h1aClgRT4EWYHmc12lSW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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