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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0def31aa470e0c839125c163007f6a176cd82496a8b47e2a8f76553a7925e56e' 
  AND token = '/tMRWA4P98w1S7eU+IRKMijXZrn/PaGy1HPxZQdi0Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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