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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e150e69c3a5982648d0bcb039cb919ecc55efd57ec7feddc063dea7212c9cc' 
  AND token = 'skNo556XERBnfMw9SZY0mzHuS1sFdzDxYAf03rb9bpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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