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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98bb4cbc9c98c652a868646a41517d5f9242cff5d4868819b901c32cebac733' 
  AND token = 'EgzNC+CszXapcWDu8/1tVobRps16SLHhTeez9IE09a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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