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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a8fc94bdb945f5b4dfc5f963a71a72a05c70fedd8349fab5c486b9c14654db' 
  AND token = 'HiovGpcayVwAHWd7gfjm1RXendtqIKXeL54U2rOirX4=' 
  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"
    }
  }
}