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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc486ed49ea4919a68fcbbaeb312569ecbb8ac72bdc4354b7d59e39802241fcd' 
  AND token = 'nnMYE+iec6AApA2q9DR2/N3I4tbMaFjSBz0CbxPtGXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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