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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70375e92d63b4e15ee7957e0df4144983536f236290b8a15d8fe006439ea73d8' 
  AND token = 'vr+Nf79vZ8PaT8ZcLT+3PJqmsx3H6TtSi60cNW2GTgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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