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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ca3032e5417ed648bba488ab784216c7a98a5eb1b2fa84eda59a61df72698ee' 
  AND token = 'hSiyvqG/AASM+FYDXOrk3WuegiyYsJ2NXqE9Fr+4b/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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