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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c4e04339b4bfdde453458933f5b03b20c72d700053cb593e2148199a55b48f' 
  AND token = 'Ltc+Ka28MDyNS/xH7ICgrckYgpOAG16hP+MFp1qWwOU=' 
  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"
    }
  }
}