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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2c10409ce1830b71ee08d5a4d7e5128960e158949ae88e3f34ff11ed028b06' 
  AND token = 'C5zdfIynr2odm4dfyPDZaqVl7DRxKiZtewhTi4Z8G+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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