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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a8f4b4a73567cd8ffe1705b93364f360d3194a8330d7f14a9222878bd66f19' 
  AND token = 's8HzH6BihbvqyZXFvg/MoWGT9ekDA3Eyh7ts4k5PMPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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