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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d831846bd7a2fb776c3163aab2502969127529a38291d89df69a1fb97666e2' 
  AND token = 'z0LrVzBmO45uFLoRmF7XBW8ud9up6I//z1/w3y2ufcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00123

JSON explain

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