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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '748291dbcbfafca0ef73f113638d5b89a8016472b067cb27baa76bae81b4a52a' 
  AND token = '7nwPzAPzBFz/mc7qbg3oh6QzSb32NZ05qDLSYYoGLf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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