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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '916108826cd2c6dd3f7986ba145a294a1cf2e4bf31309eb418aa934b84d00f6b' 
  AND token = '4qdlUkXNfNoKDLZx5zoOICJQD+iLSniMokR7S2sha70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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