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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67c89652bd5f9bf5780c0917fbaa42d212c1aa9aee6c0b84a027e164e77e35b' 
  AND token = 'QN6fxWXHgCZYPEAVwhzPgqu2J0P7ocTiCe3hP7JV11Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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