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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736b2b90a5c7d8658693309935440e2838398f224eeb1c3283ef3bd3d4fb510d' 
  AND token = 'dAiG2gN+NPJXKeMgfuTRND5BLgw97d88O/6PFRxw4wk=' 
  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"
    }
  }
}