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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f98657c700fc25efbd62db3e7842d64cb4e2d4eae2cc179f3fcc7f45d03776e' 
  AND token = 'wzRKnmQo6IeUPUBc5NjjP+7fuq8yejQSIdMH4fURPTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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