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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c35abf78e8c22ec460f568c109d00c1965cf8a32cd7f73d665e40e4c408de39' 
  AND token = '+AtgKHWuVTXINWxis4WeHI53YN16ys1j6uECKdr3dRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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