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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfdaababf004cd5f45b6db992761e9521fb24c1783cad759b364c10bea4259db' 
  AND token = 'rcNbycFRL1yjGdXP3WBDqkYm0kNri5Ok6cSm+7OxB0k=' 
  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"
    }
  }
}