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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61006d2ec5036e76463a2639936096d1716508488ccf7a4e3549f20ebbd26da8' 
  AND token = 'VvAIlRDXAi10pd0KhevkcM1Gp8bMHpC9nJgWunqRxfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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