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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09605a07b856b9d80772f202959f8e5c8d2d4500c769e13e8a5777b02726727e' 
  AND token = 'uUjg2lIWSXrS50HACsVvcQJCTp3X970uoqIkMC9SQ5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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