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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46706148854afad32c725ae2b2434b3bf660c8c584ed68b2c4c43fbec3c5832a' 
  AND token = 'Svz8tFhRAWJv8+oaIshIhuFS6KYp83WUeQ04AzLGWjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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