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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10b128358e79738f28c935112d543df2fd6f125919da0e5a3ff349ccafadb7e4' 
  AND token = '1i/+VfGBlnIpw5ZrsJ3nA8+su2eCvektVGHmCdeFj1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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