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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac0e62c3f095adcc6229354c0ea95f11bed8f2e352800f7aa491d82deb220b6' 
  AND token = '6ussC0ipqlGlpuPXogChpIqu0xtsT/jX2MXYW4mIxUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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