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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e105f84d6aed8130ffa68056a4a71fedd8e3e63a48f099ed3a952a7d4023ae0' 
  AND token = 'yf95wTopWsPgeaEME+p0KDoZt71zHElyRL8ogagwPeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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