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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae6af2162121eb43b12a5b0d274024261b8ebf568782149b7db098467a638c7e' 
  AND token = '8ksWL/46oN4g6afVagkWA2kaY61ZU4MHEr/X06KS4P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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