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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae7c95f49a246c0b44fd0b214b0c13b32c720988b32c24eac4dfbaff6bec5d7' 
  AND token = 'OAOT9ltGxFLHKhJEK89BtVfpkgNuded0KOVWjOIiwuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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