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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f7a9e9b1a1997146cb512ab9523c1985985d6e8fa2632237de58b7e2b633af' 
  AND token = '8OotlCDVGv8UaA5nT2MnxJkWn7WFt9n11uBMfipVaJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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