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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a285d52e77a92285c91d57725c34b8a6ce37ff87e2be51245ed86851c0f09280' 
  AND token = 'gqcxhaHaKJDn7NrZskWyCst4B0Vy6wapQj5xmNDm+3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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