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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b995af6268af7bd1506c964966d006840c311c1cd9c551146fe1fe289fa33a' 
  AND token = 'fZvFHaSAQpBSgD6G6pEVnfH7l+03XHSPsclDm9t08bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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