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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9bda4e22b7a8c24d4d6fb7c815d00cd67bd5ed558ef760ccbd26329e9d5f20' 
  AND token = 'T4vNMaNhMqGxfhpLChuZ6B2mz5H1oLBFhvVV4Lchy/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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