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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5be28e16fd31833df7433359e6d85e6ad07270ba67cac7d21f0d72034ed9e374' 
  AND token = 'a5ElsVnY8IoMt8vyyEpI+Xnntc0Eres+gfj9lwR8EHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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