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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d100362812aca7f775bf11c31490fb7898887d8959b8a49fd103fc7c03a95f1' 
  AND token = 'v1z9JkJYGKMqPqOxeQtsH2IO1W3YB20aUUFlb2A08gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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