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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b70b149417abc450730e26a0206d83d15de577101c767dd75b8c53b6b488e54' 
  AND token = 'fRR6y/w4X/Ij+lgnx0TqylHglpxEL+nZY8fngaX/AMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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